1)ping:检测网络连接的正常与否,主要是测试延时、抖动、丢包率。 但是很多服务器为了防止攻击,一般会关闭对ping的响应。所以ping一般作为测试连通性使用。ping命令后,会接收到对方发送的回馈信息,其中记录着对方的IP地址和TTL。TTL是该字段指定IP包被路由器丢弃之前允许通过的最大网段数量。TTL是IPv4包头的一个8 bit字...
No buffer space available EISCONN 106 Transport endpoint ENOTCONN 107 Transport endpoint ESHUTDOWN 108 Cannot send after transport ETOOMANYREFS 109 Too many references ETIMEDOUT 110 Connection timed ECONNREFUSED 111 Connection refused EHOSTDOWN 112 Host is down EHOSTUNREACH 113 ...
ping [-dfnqrRv][-c<完成次数>][-i<间隔秒数>][-I<网络界面>][-l<前置载入>][-p<范本样式>][-s<数据包大小>][-t<存活数值>][主机名称或IP地址] ping命令说明 PING()SystemManager's Manual: iputils PING(8) NAME ping, ping6 - send ICMP ECHO_REQUEST to network hosts SYNOPSIS ping [-L...
这个目录是一个虚拟的目录,它是系统内存的映射,我们可以通过直接访问这个目录来获取系统信息。 这个目录的内容不在硬盘上而是在内存里,我们也可以直接修改里面的某些文件,比如可以通过下面的命令来屏蔽主机的ping命令,使别人无法ping你的机器: echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_all /root: 该目录为...
# ping192.168.11.123 1.3网卡启动与关闭 除了使用ifconfig配置之外,也可以使用ifup、ifdown命令来实现。 代码语言:javascript 复制 # ifup eth0//开启eth0网卡# ifdown eth0//关闭eth0网卡 二、查看内核已经支持的网卡驱动 进入到内核配置菜单目录下:
代码语言:javascript 复制 heidsoft@heidsoft-dev:~$ wget--no-proxy http://172.16.59.20/bigfile--2023-02-2521:48:04--http://172.16.59.20/bigfile Connecting to172.16.59.20:80...connected.HTTPrequest sent,awaiting response...200OKLength:10737418240(10G)[application/octet-stream]Saving to:‘bigfile...
an error is returned. This option can be used to ping a local host through an interface that has no route through it provided the option -I is also used. -s packetsize Specifies the number of data bytes to be sent. The default is 56, which translates into 64 ICMP data bytes when co...
large ping packet udp flooding fragmentation bombs buffer overflows icmp redirect bombs Linux security. suid/ suig. To diable the suid bits on selected programs.chmod a-s /usr/bin/chage chmod a-s /usr/bin/gpasswd chmod a-s /usr/bin/wall ...
When you ping the instance, ping packets are discarded or the ping fails. The following error message frequently appears in the /var/log/message system log: Feb 6 16:05:07 i-*** kernel: nf_conntrack: table full, dropping packet. Feb 6 16:05:07 i-*** kernel: nf_conntrac...
The df command displays disk space usage for file systems. It shows the filesystem name, total/used/available space, and capacity.For example:df -hThe above command will print the disk utilization in a human-readable format. You can also run it without arguments to get the same data in ...